Not sure if you are meaning that your data was erased unintentionally, or whether you want to erase it. To erase your data, if you want to delete just a form or two, on the summary page, click delete to remove the form. To erase your return and start over, go to the return manager (Tools > Return Manager) and click Create new return. The new return will be completely empty. To delete the old one, simply go back to the return manager and click on delete for the old return.